diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 01848d823217..bf8a055e1a38 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1539,5 +1539,5 @@ in let inherit (pkgs) callPackage; in rec
 
   ocamlPackages_latest = ocamlPackages_4_13;
 
-  ocamlPackages = ocamlPackages_4_12;
+  ocamlPackages = ocamlPackages_4_13;
 }